I see that others have addressed how Catholics view Sacred Tradition. I probably will repeat what has already been said, however I would like to be clear on how Catholics view Sacred Tradition, which is primarily what the OP is about (first you have to know
what it is before you can ask
where it is).
The
Catechism of the Catholic Church gives a decent overview of what Sacred Tradition is, what Sacred Scripture is, and the relationship between the two. It is important to realize that there is a difference between “Sacred Tradition” and “traditions” (with a small “t”, and which the Catechism terms “ecclesial traditions”):
**"83 The Tradition here in question comes from the apostles and hands on what they received from Jesus’ teaching and example and what they learned from the Holy Spirit. The first generation of Christians did not yet have a written New Testament, and the New Testament itself demonstrates the process of living Tradition.
Tradition is to be distinguished from the various theological, disciplinary, liturgical or devotional traditions, born in the local churches over time. These are the particular forms, adapted to different places and times, in which the great Tradition is expressed. In the light of Tradition, these traditions can be retained, modified or even abandoned under the guidance of the Church’s Magisterium."**
So, things like the rosary, how many candles to put around the altar, Gregorian Chant, Christmas trees, genuflecting before the tabernacle, the sign of the cross, etc. are “traditions” and are not part of what is Sacred Tradition. This is important, because when many non-Catholics attempt to discuss Sacred Tradition, they are typically thinking about “ecclesial traditions” and not “Sacred Tradition”.
More from the Catechism:
**"81 "Sacred Scripture is the speech of God as it is put down in writing under the breath of the Holy Spirit."42
"And [Holy] Tradition transmits in its entirety the Word of God which has been entrusted to the apostles by Christ the Lord and the Holy Spirit. It transmits it to the successors of the apostles so that, enlightened by the Spirit of truth, they may faithfully preserve, expound and spread it abroad by their preaching."43 "**
Sacred Tradition being defined as “transmit[ting] in its entirety the Word of God…” is important. I believe that the Orthodox Church defines this in an even better way than the Catholic Church. While Catholics typically see Sacred Tradition and Sacred Scripture as two separate entities that interact, Orthodox see Sacred Scripture as a
subset of Sacred Tradition, i.e. the written form of Sacred Tradition.
The early Christians did not have a Bible to refer to. Nor was there a Catechism, or list of beliefs. Instead, they were taught by authorized leaders, and still had the same truths found in the Bible. This is Sacred Tradition-the transmission in its entirety the Word of God. The Catechism further states-"
This living transmission, accomplished in the Holy Spirit, is called Tradition, since it is distinct from Sacred Scripture, though closely connected to it. Through Tradition, “the Church, in her doctrine, life and worship, perpetuates and transmits to every generation all that she herself is, all that she believes.”"
Tradition is seen as a “living” transmission. And this brings me really to the OP. There is no “list” or “book” of Sacred Tradition. It is found in the life of the Church. As someone previously mentioned, there is no division of doctrines found in Tradition versus doctrines found in the Bible. The two are firmly tied together (and in Orthodoxy, Scripture is simply the written form of Tradition), and doctrines found in Scripture may be made more explicit in Tradition. One example of this is Sunday worship. Hints of this can be found in the Bible (Christians gathering to do certain things on the first day of the week), yet there is simply no “Christians gather to worship every week on Sundays” commandment. Instead, we believe that this is part of Sacred Tradition, and is evidenced in the life of the Church, as a “living transmission”. The early Christians worshipped on Sundays, and so do we, yet Scripture doesn’t say this explicitly. Another example is the Biblical Canon. The Bible does not tell us which books are in the canon. Instead, we believe that the Canon was preserved throughout Christian history, through the Church.
So, it is important to realize that there is simply no list or book of Sacred Tradition. Sacred Tradition is not the same as the various ecclesial traditions. Sacred Tradition can find its way into “official” documents, such as those from Ecumenical Councils. It may also be helpful to read the
Dogmatic Constitution on Divine Revelation-Dei Verbum for more information on this subject.